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Updated: Feb 14, 2026
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Performing Intracochlear Electrocochleography During Cochlear Implantation
Published on: March 8, 2022
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Assessment of Cochlear Function during Cochlear Implantation by Extra- and Intracochlear Electrocochleography
Adrian Dalbert1, Flurin Pfiffner1, Marco Hoesli1
1Department of Otorhinolaryngology - Head and Neck Surgery, University of Zurich, University Hospital of Zurich, Zurich, Switzerland.
Frontiers in Neuroscience
|February 14, 2018
Summary
Electrocochleography (ECoG) during cochlear implantation can detect changes correlating with hearing loss. Decreased ECoG signals during surgery indicate potential cochlear trauma, particularly during final electrode insertion.
Area of Science:
- Otolaryngology
- Neuroscience
- Biomedical Engineering
Background:
- Cochlear implantation aims to restore hearing but carries risks of cochlear trauma.
- Monitoring electrophysiological changes during surgery is crucial for assessing potential hearing loss.
Purpose of the Study:
- To investigate the correlation between electrophysiological changes during cochlear implantation and postoperative hearing loss.
- To identify the timing of electrophysiological changes during the implantation procedure.
Main Methods:
- Utilized extra- and intracochlear electrocochleography (ECoG) during cochlear implantation.
- Recorded ECoG using needle electrodes and the cochlear implant (CI) electrode itself.
- Correlated ECoG changes with pure-tone audiometry results 4 weeks post-surgery.
Main Results:
- Changes in extracochlear ECoG correlated with postoperative hearing changes (r = -0.44, p = 0.055).
- Subjects with decreased ECoG signals experienced significantly greater hearing loss (22 dB) compared to those without (12 dB, p = 0.0058).
- ECoG signal decrease during insertion occurred in the latter half of the process, suggesting trauma during final electrode placement.
Conclusions:
- ECoG effectively detects intraoperative electrophysiological changes during cochlear implantation.
- Decreased extracochlear ECoG signals during surgery predict postoperative hearing loss.
- Cochlear trauma likely occurs during the final stages of CI electrode insertion, highlighting the need for careful monitoring.
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